Provenence graph is a directional graph. The search on the graph edges is done by key words BACKWARDS and FORWARDS with a numerical value that defines the number of edges taken into account.Implementation of FORWARDS will be optional (voted, 4 pro; 1 against) If not implemented but given, return an error. To get all edges in a direcion, use FORWARDS=ALL resp. BACKWARDS=ALL.If ommitted, they default to zero.

Discussion on the graph walking. The provenance of a node can be queried in given depth. Keyword BACKWARDS (ALL as default value) and FORWARDS (0 as default) can be used for that. Optional there are following keywords set at false on default:

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Discussion on the open issues in the draft

time plan for the provenance draft to become an IVOA recommendation

description classes discussion (started by Mathieu) here or in next section